Wrench



July 19, 1938. D, E AN E 2,124,163 I I WRENCH Original Filed March 1, 1937 Invas n Dawr-Y J. EMRNUEL- Patented July 19, 1938 UNITED STATES PATENT QFFlCE Application March 1,

1937, Serial No. 128,387

Renewed June 15, 1938 1 Claim.

My invention relates to improvements in wrenches and the main object is to provide a wrench which is self adjusting to the size of the work and by which a powerful grip may be ob- 5 tained on the work.

Another object is to provide a wrench particularly suited for use as a pipe wrench and including a pair of work gripping jaws slidably connected and with a handle pivotally connected to one jaw and connected by a draw bar to a cam which operates against that jaw through the shank of the other in such manner that the normal pull on the handle to operate the wrench on the work will cause a closing motion of the jaws on the work while the opposite movement will open the jaws and free the wrench from the work.

Another object is to provide a wrench of this kind in simple, durable and inexpensive form.

With these and other objects in view the invention resides in the novel construction and arrangement of parts as hereinafter fully set forth and claimed, reference being had to the accompanying drawing as showing a preferred embodiment of my invention for purposes of exemplification.

In the drawing:

Figure 1 is a side view of the wrench in opened position.

Figure 2 is an edge view.

Figure 3 is a side View of the wrench in closed or work engaging position.

In carrying out my invention I provide a pair of jaws 5 and 6, one (5) being hereinafter termed 35 the fixed jaw and the other (6) the movable jaw. The said fixed jaw 5 has a shank I turned at right angles and the same is split longitudinally to provide a cleft 8 parallel with the jaw and extending from a point in alignment with the jaw clear out through the end of shank. The spaced sides 9 of the shank also have the narrow aligned slots I extended longitudinally but considerably shorter than the shank. The movable jaw 6 has a shank I I extended from its end substantially parallel with its axis but offset laterally as at I2. The junction of the jaw 6 and shank I I is notched out at I 3 on each side so as to fit the cleft 8 and play slidably therein. The structure is thus such that the jaws may be 50 moved together or apart as desired.

A handle I is provided and has its inner end I6 forked and pivotally connected at H to the end of the movable jaw shank I I. A draw bar I8 is pivotally connected at one end to a link I9 which in turn is pivotally mounted at 20 in the cleft formed at the forked end I6 of the handle I5 outwardly of the pivotal connection I'l thereof. The other end of the draw bar I8 is forked at ZI forming fingers 22 which straddle the fixed jaw shank I. A pin 23 is passed through these 5 fingers 22, through the slots ill and through the notched portion of the movable jaw shank II, this pin connecting the draw bar and shank II but allowing the latter to still play freely in the shank I.

A draw cam or block 24 of triangular shape is pivotally connected at one corner 25 to a link 26 which is pivotally mounted at its other end at 21 in the cleft between the draw bar fingers 22 rearwardly or outwardly from the shank i. This block 2 is slidably mounted in the shank cl'eft 8 outwardly of the shank II and is held therein by a roller 28 mounted in the outer end of the cleft and journaled on a pin 29 extended crosswise through the shank sides 9.

The adjacent gripping faces 30 of the jaws 5 and 6 are serrated or toothed as shown. The extremities of the draw bar I8 are both turned at an angle from the medial section thereof as indicated at 3| so that the bar will stand out in substantially spaced relation from the jaw shank II.

In operation the handle I5 when swung to the position shown in Figure 1 opens the jaws 5 and 6 or spreads them apart and they may be adjusted to the work. Then when the handle is pulled in the direction indicated in the arrow and which is the direction in which the wrench is pulled to operate the work the jaws are closed on the work. This action is brought about by the pivotal action of the handle at the point I? which exerts a pull on the link I9 swinging the outer end of the draw bar I8 in the same direction and transmitting a pull through the link 25 to the cam block 24. This cam block as it is pulled through the shank i operates by its sloping face 32 on the roller 28 and its opposite face 33 forces the movable jaw shank I I inwardly in the cleft 8 and moves the jaw 6 toward the jaw 5. Of course the harder the handle I5 is pulled the greater will be the force exerted on the jaws and the tighter the grip on the work. As the handle I5 is pulled the outer end of the shank II is forced upwardly (as viewed in the drawing) and the shank rocks on the pin 23 also causing the jaw 6 to move toward the jaw 5 as indicated.

When this pull on the handle I5 is relaxed the cam block 25 is released and the jaws may spread as the wrench is removed from the work.

The wrench of course may be made in any size desired and for use as either a pipe or monkey Wrench.

While I have herein set forth a certain preferred embodiment of my invention it is understood that I may vary from the same in minor structural details so as to provide a practical device for the purposes intended, not departing from the spirit of the invention and within the scope of the appended claim.

I claim:

In a wrench, a fixed jaw, a shank extended at right angles therefrom and having a cleft, the said shank also having aligned slots, a movable jaw having a shank slidably extended out through the said cleft at right angles to the fixed jaw shank, a handle pivotally connected to the shank of the movable jaw, a draw bar pivotally connected at one end to the handle, the other end of the draw bar being pivotally connected to the shank of the movable jaw through the slots in the shank of the fixed jaw, a triangular cam block connected to the draw bar and slidably mounted in the cleft in the shank of the fixed jaw, and a roller journaled in the said cleft and confining the cam block therein.

DEWEY J. EMANUEL. 

